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Asynchronous Data Unit (ADU)
Asynchronous Data Unit (ADU)
The Z3A ADU is a small DCE-type limited-distance modem that allows direct connection between
RS-232 equipment and the system digital switch. Used in conjunction with the Data Line circuit
pack (System 75, DEFINITY G1 and G2) or the EIA Port circuit pack (System 85), the ADU com-
pletes the direct link between the system switch and EIA terminals, printers, and host computer
ports. In these applications, DTE devices can access the switch without using a separate data
module or modem. The ADU is installed at the device end of the EIA connection. ADUs can
also be hard-wired in pairs with other ADUs to interface data terminals directly to a host com-
puter. This application is typical when access to the host is not made through the system.
Features
Speed
Standard data rates from 0.3 to 19.2 kbps and non standard data rates below 1.8 kbps.
The auto adjust option will automatically match the transmission speed to the attached
RS-232.
Full-duplex
Asynchronous
Built-in protection against voltage surges.
Physical Description
Dimensions
Note: The following dimensions are approximate.
Width = 2-1/4 inches
Depth = 4-3/4 inches
Height = 1 inch
Switch
An optional Originate/Disconnect switch can be used with the Z3A1, Z3A2, and Z3A4 ADUs.
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